Moteur à compression JBL 2451J
[2451J-16] Avis/Critiques L'embouchure de sortie de 38mm propre aux moteurs 2451 (et 2447) et leur permet de se coupler directement au pavillon bi-Radial, ce qui maintient un niveau de distorsion extrêmement bas et contribue à améliorer la dispersion. Le diaphragme de 100mm intègre la technologie de suspension en diamant trois dimensions exclusive à JBL. Cette combinaison permet de maintenir une réponse linéaire de 5 à 20kHz.
Le 2451J est équipé de masses magnétiques au Néodyme permettant des performances électro-magnétique équivalentes à celle d'une masse standard trois fois supérieur.
-100 watts continuous program above 500 Hz
-150 watts continuous program at 1 kHz and higher
-Neodymium rare-earth magnet structure provides high output, light weight, and compact size
-Coherent Wave™ phasing plug design for increased high frequency output
-100 mm (4 in) pure titanium diaphragm with radial-rib topology
-38 mm (1½ in) throat exit diameter
-100 mm (4 in) edgewound aluminum voice coil
Throat Diameter: 38 mm (1½ in)
Nominal Impedance: 2451H 8 ohms
2451J 16 ohms
Minimum Impedance: 6 ohms (H), 12 ohms (J) @ 5 kHz
DC Resistance: 4.3 ohms (H), 8.5 (J) ± 10% @ 25°C
Power Rating’: 100 W continuous program above 500 Hz
150 W continuous program above 1 kHz
Sensitivity: 111 dB SPL, 1 W @ 1 m on-axis on horn²
118 dB SPL, 1 mW on plane wave tube³
Nominal Efficiency: 30% (500 Hz to 2.5 kHz)
Frequency Range: 500 Hz or higher, 12 dB/octave minimum
Recommended Amplifier Powerd: 200 W into 8 ohms
Diaphragm: 0.05 mm (0.002 in) pure titanium
Voice Coil Diameter: 100 mm (4 in)
Voice Coil Material: Edgewound aluminum ribbon
Flux Density: 1.9 T (19,000 gauss)
B1 Factor: 12.7 (H) T m
18 (J) Tm
Polarity: Positive voltage to black terminal produces diaphragm
motion toward phasing plug
Dimensions: 167 mm (6 in) diameter
76 mm (3 in)
Mounting: Four ¼-20 threaded holes, 90° apart on 114 mm
(4½ in) diameter
Net Weight: 4.5 kg (10 lb)
1- Continuous program power is defined as 3 dB greater than continous pink noise and is a Conservative expression of the transducer’s ability to handle normal speech and music program material Continous pink noise power ratings are rested with a pink noise input having a 6 dB crest factor, with a higher pass filter set to the specified lower frequency, for two hours duration.
2- Sensitivity measured with 1 W input at 1 m distance on-axis from the mouth of the horn with a Q of 6.3 averaged in the 2 kHz octave band
3- As specified by recognized standards organizations, sensitivity is measured with the driver coupled to a plane wave tube The JBL sensitivity rating represents the SPL in a 25 mm (1 in) terminated tube, using a 1 mW input signal (0.126 V into 16 ohms) swept from 500 Hz to 2.5 kHz.
4- Recommended power amplifier rating is a guide for amplifier selection considering normal program material and line voltage available to amplifiers, although lower power amplifiers may be utilized.
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